VoIP ¼­ºñ½º¸¦ Á¦°øÇϱâ À§Çؼ­´Â »ç¿ëÀÚ °³°³Àο¡ ´ëÇÑ µ¶¸³ÀûÀÎ ½Äº°ÀÚ°¡ ÇÊ¿äÇÏ°Ô µÈ´Ù. ÀÌ¿Í °°Àº ½Äº°ÀÚ¸¦ ÅëÇØ »ç¿ëÀÚÀÇ À§Ä¡ ¹× Á¢±Ù¹æ¹ýÀ» ¾Ë¼ö ÀÖ°í À̸¦ ¹ÙÅÁÀ¸·Î È£ ¼³Á¤ ¹× ¿©·¯ ¼­ºñ½º¸¦ ÀÌ¿ëÇÒ¼ö ÀÖ°Ô µÈ´Ù.
VoIP ¼­ºñ½º¿¡¼­´Â »ç¿ëÀÚ°£ÀÇ ½Äº°ÀÚ·Î URL(Uniform Resource Locators)À» »ç¿ëÇÏ°í ÀÖ´Ù. º» Àý¿¡¼­´Â VoIP ¼­ºñ½ºÀÇ ÁÖ¼Ò ¹× ¹øȣü°èÁß SIP-URL°ú TEL-URL¿¡ ´ëÇØ »ìÆ캸°í ENUM¿¡ SIP¸¦ Àû¿ëÇßÀ» °æ¿ì È£ ¼³Á¤ ÀýÂ÷¿¡ ´ëÇØ »ìÆ캸µµ·Ï ÇÑ´Ù.

SIP URLÀº SIP¸ÁÀÇ »ç¿ëÀÚ°£¿¡ ½Äº°ÀÚ¸¦ Á¦°øÇØ ÁÖ´Â ¿ªÇÒÀ» ÇÑ´Ù. ÀÌ·¯ÇÑ SIP URlÀº À̸ÞÀÏÁÖ¼Ò¿Í ºñ½ÁÇÑ Çü½ÄÀ» »ç¿ëÇÏ°í ÀÖ´Ù. SIP-URLÀÇ ±âº»ÀûÀÎ Æ÷¸ËÀº ¾Æ·¡¿Í °°´Ù.

SIP-URL = " sip:" [ userinfo "@" ] hostport url-parameters [ headers ]

Sip-URLÀÇ Æ÷¸ËÀ» »ìÆ캸¸é SIP ÇÁ·ÎÅäÄÝÀ» ¸í½ÃÇÏ´Â ¡°sip¡±·ÎºÎÅÍ ½ÃÀ۵ȴÙ. @ÀüÀÇ userinfo´Â »ç¿ëÀÚ ¾ÆÀ̵ð ¹× Æнº¿öµå ¶Ç´Â ÀüÈ­¹øÈ£°¡ ±â·ÏµÈ´Ù. @µÚÀÇ Çʵå´Â »ç¿ëÀÚ°¡ À§Ä¡ÇÑ SIP µµ¸ÞÀγ×ÀÓÀ̳ª IPÁÖ¼Ò°¡ »ç¿ëµÇ°í Ãß°¡·Î url-parameter°¡ ±â·ÏµÈ´Ù.
ÀÌ¿Í °°Àº SIP-URLÀ» »ç¿ëÇÒ °æ¿ì Á¤È®ÇÑ ÆĶó¹ÌÅÍ ¹× ÇØ´ç Çʵ忡 ´ëÇÑ Á¤ÀÇ´Â ¾Æ·¡¿Í °°´Ù.

SIP-URL = " sip:" [ userinfo "@" ] hostport url-parameters [ headers ]
userinfo = user [ ":" password ]
user = *( unreserved | escaped | "&" | "=" | "+" | "$" | "," )
password = *( unreserved | escaped | "&" | "=" | "+" | "$" | "," )
hostport = host [ ":" port ]
host = hostname | IPv4address | IPv6reference
hostname = *( domainlabel "." ) toplabel [ "." ]
domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum
toplabel = alpha | alpha *( alphanum | "-" ) alphanum
IPv4address = 1*3digit "." 1*3digit "." 1*3digit "." 1*3digit
IPv6reference = ¡°[¡° IPv6address ¡°]¡±
IPv6address = hexpart [¡°:¡± IPv4address]
hexapart = hexaseq — hexaseq ¡°::¡± [hexseq] – ¡°::¡± [hexaseq]
hexaseq = hex4 *(¡°:¡± hex4)
hex4 = 1*4HEX
port = *digit

SIP URLÀÇ ¿¹Á¦¸¦ »ìÆ캸¸é ¾Æ·¡¿Í °°´Ù. °¢ ¿¹Á¦´Â ÀϹÝÀûÀÎ SIP URLÀÇ Çü½Ä°ú url-parameter°¡ ºÙ¾úÀ»°æ¿ì¿¡ ÇØ´ç Æ®·£½ºÆ÷Æ®(Transport)°èÃþÀÇ ÇÁ·ÎÅäÄÝÀ» Á¤ÀÇÇÑ °æ¿ì, ¸ÖƼÄɽºÆ® ÁÖ¼Ò¸¦ »ç¿ëÇÒ °æ¿ì, Tel UrlÀ» »ç¿ëÇÒ °æ¿ìÀÇ ¿¹Á¦¸¦ º¸¿©ÁÖ°í ÀÖ´Ù.

sip:j.doe@big.com
sip:j.doe:secret@big.com;transport=tcp
sip:j.doe@big.com; maddr=239.255.255.1;ttl=15
sip:j.doe@big.com?subject=project%20x&priority=urgent
sip:+1-212-555-1212:1234@gateway.com;user=phone
sip:1212@gateway.com
sip:alice@10.1.2.3
sip:alice@example.com
sip:alice%40example.com@gateway.com
sip:alice@registrar.com;method=REGISTER

Tel URLÀº ÀüÈ­¸ÁÀÇ °¡ÀÔÀÚ°¡ ÀÚ½ÅÀÇ ÀüÈ­¹øÈ£³ª Æѽº¹øÈ£¸¦ »ç¿ëÇÏ¿© VoIP¸¦ ¼­ºñ½º ¹ÞÀ» °æ¿ì »ç¿ëÀÚ °³°³ÀÎÀÇ ½Äº°ÀÚ¸¦ »ý¼ºÇÏ´Â ¹æ¹ýÀ» ³ªÅ¸³»°í ÀÖ´Ù. ¾Æ·¡´Â Tel URlÀÇ ¿¹Á¦ÀÌ´Ù.

tel:+358-555-1234567
fax:+358.555.1234567
modem:+3585551234567;type=v32b?7e1;type=v110
tel:+358-555-1234567;postd=pp22
tel:0w003585551234567;phone-context=+3585551234
tel:+1234567890;phone-context=+1234;vnd.company.option=foo

ÀÌ»óÀÇ SIP-url, Tel-urlµîÀº IP±â¹Ý ´Ü¸»±â, Áï IP Phone, IP ¿µ»ó´Ü¸»±â, PC»óÀÇ ¼ÒÇÁÆ®¿þ¾îÆù µî¿¡¼­ ÀüÈ­ÇÏ°íÀÚÇÏ´Â »ó´ë¹æÀ» ÁöÁ¤ÇÒ ¶§ »ç¿ëÇÏ´Â ¹æ½ÄÀÌ´Ù. ¸¸ÀÏ ÀϹÝÀüÈ­±â¸¦ °ÔÀÌÆ®¿þÀ̵ ¿¬°áÇÏ¿© »ç¿ëÇϰųª, À§ÀÇ IP´Ü¸»±â¿¡ »ç¿ëÇÒ °æ¿ì °ÔÀÌÆ®¿þÀÌ, IP PhoneÀº ÀԷ¹ÞÀº ÀüÈ­¹øÈ£¸¦ ÀÚüÀûÀ¸·Î º¯È¯ÇÏ¿© ½ÅÈ£ÇÁ·ÎÅäÄݸ޼¼Áö(H.323, SIP, MGCP µî)¿¡ Àû¿ëÇÏ¿© »ç¿ëÇÏ°Ô µÈ´Ù.

ENUMÀº 'Telephone Number Mapping' ȤÀº 'E.164 Number Mapping'ÀÇ ¾à¾î·Î, ÀϹÝÀûÀ¸·Î »ç¿ëµÇ°í ÀÖ´Â E.164 ±â¹ÝÀÇ ¹øÈ£·ÎºÎÅÍ(ÀÏ¹Ý ÀüÈ­¹øÈ£) ±× ¹øÈ£¸¦ »ç¿ëÇÏ´Â ´Ü¸» ¶Ç´Â »ç¿ëÀÚÀÇ ÀÎÅͳÝÁÖ¼Ò, urlµîÀÇ ½Äº°Á¤º¸¸¦ ã¾ÆÁÖ´Â ÀüÈ­¹øÈ£ºÎ ¼­ºñ½º °°Àº °ÍÀÌ´Ù.(ÀÏÁ¾ÀÇ µð·ºÅ丮 ¼­ºñ½º) ENUMÀ» »ç¿ëÇÏ°Ô µÇ¸é ´Ù¾çÇÑ ÀÎÅÍ³Ý °ü·Ã±â¼ú(VoIP, FoIP, Teleconference)À» »ç¿ëÇÏ¿© ÀÎÅͳÝÀüÈ­, FAX, ¹«¼±ÀÎÅÍ³Ý µî ´Ù¾çÇÑ ¼­ºñ½º¿¡ ÀϹÝÀüÈ­¹øÈ£·Î ¼Õ½±°Ô Á¢±ÙÇÒ ¼ö ÀÖ´Ù.
º» Àý¿¡¼­´Â RFC 2916¿¡¼­ Ç¥ÁØÈ­µÈ ³»¿ëÀ» ¹ÙÅÁÀ¸·Î SIP ¼­¹ö¿Í ÀüÈ­¸Á »ç¿ëÀÚ°£ÀÇ È£ ¼³Á¤ È帧¿¡ ´ëÇØ ¼³¸íÇϵµ·Ï ÇÑ´Ù. ENUM ¼­ºñ½º´Â NAPTR RR(Resource Record)À» ÀÌ¿ëÇØ ±âÁ¸ÀÇ µµ¸ÞÀγ×ÀÓ¼­ºñ½º(DNS) ü°è¸¦ »ç¿ëÇÏ¸ç ±× Ã¼°è´Â ´ÙÀ½ ±×¸²°ú °°´Ù.

±×¸² 1. ENUMÀÇ »ç¿ë

ÀüÈ­¸ÁÀÇ »ç¿ëÀÚ´Â E.164 : 82-42-860-6117·Î ´ÙÀ̾óÀ» ÇϰԵǸé È£ ¼³Á¤ ÀýÂ÷°¡ ½ÃÀÛµÇ°Ô µÈ´Ù. À̶§ GW´Â ¼ö½ÅµÈ Á¤º¸¸¦ ENUM ü°è·Î º¯È¯(7.1.1.6.0.6.8.2.4.2.8.e164.arpa)ÇÑÈÄ DNS¿¡°Ô ÁúÀǸ¦ ÇϰԵȴÙ. À̸¦ ¹ÞÀº DNS´Â ENUM ü°è¸¦ °Ë»öÇÏ¿© ±×¿¡ »óÀÀÇÏ´Â SIP URLÀ» Àü¼ÛÇÏ°Ô µÈ´Ù. ¼ö½ÅµÈ Á¤º¸¸¦ ¹ÙÅÁÀ¸·Î GW´Â ´Ù½Ã È£½ºÆ®³×ÀÓÀÇ IP ÁÖ¼Ò¸¦ ÀÀ´ä¹ÞÀºÈÄ ÇØ´ç È£ ¼³Á¤ ½Ã±×³Î¸µÀ» SIP ¼­¹ö¿¡°Ô Àü¼ÛÇÏ°Ô µÈ´Ù. SIP ¼­¹ö´Â SIP URL¿¡ ÇØ´çÇÏ´Â »ç¿ëÀÚ¿¡°Ô ¸Þ½ÃÁö¸¦ Àü´ÞÇÏ°Ô µÈ´Ù. ÀÌÈÄÀÇ È£¼³Á¤ È帧Àº ±âº»ÀûÀÎ SIP È£¼³Á¤ ÀýÂ÷¿Í µ¿ÀÏÇÏ´Ù.

¡Ø º» ÀÚ·áÀÇ ÀúÀÛ±ÇÀº ¸ðµÎ ¼þ½Ç´ëÇб³ ³×Æ®¿öÅ©¿¬±¸½Ç(DCN)¿¡ ÀÖ½À´Ï´Ù.